Establishing an accurate renewable energy unit model is the basis for researching impact of large-scale renewable energy access on system. However

only black-box model of manufacturer can be obtained in actual modeling work. Multi-manufacturer models and multi-control modes of renewable energy units (REU) also bring difficulties to simulation modeling and analysis. First

the rationale for a structured model is analyzed. Combination strategies of “switching control” and “transient control” are put forward

and it is pointed out high voltage ride-through (HVRT) and low voltage ride-through (LVRT) control mode of REU has analytical consistency. Then

taking doubly-fed induction generator (DFIG) as an example

based on a large number of HVRT and LVRT response characteristic curves of the DFIG and detailed fault response stage division

fault ride-through characteristics are analyzed. An equivalent model of “switching control” with multiple response periods combined with multiple control modes is constructed. The electromagnetic transient model of the whole working condition is established on the basis of general fault ride-through equivalent “switching control” and “the steady-state power control”

”transient control” of the DFIG. Finally

simulation and error analysis verify the proposed model's effectiveness and applicability.